4MA0 Higher June 2015 Paper 3 Q12

EdexcelHigherOld spec3 marksAverages (including IQR)

12 There are 32 students in Mr Newton’s class.
20 are boys and 12 are girls.
The mean height of the boys is 151 cm.
The mean height of the girls is 148 cm.
Calculate the mean height of all the students in Mr Newton’s class.

(3)

Mark scheme

Scheme	Marks
20 × 151 (= 3020) or 12 × 148 = (1776) or 4796	M1
(“3020” + “1776”) ÷ (12 + 20) or (“3020” + “1776”) ÷ 32	M1 dep
149.875	A1
	(3)

Notes

A1: for 149.875 rounded or truncated to 1 or more decimal places
Accept 150 if M2 awarded